How Much Is an Additional Ounce Stamp Worth?

Understanding postage requirements is important when sending mail. Postage costs are determined by mail class, destination, and item weight. Standard First-Class letters have a base weight limit. Items exceeding this initial weight require additional postage. This additional postage uses specific stamps for incremental weight.

Current Value of an Additional Ounce Stamp

An additional ounce stamp is valued at $0.29. This stamp covers the cost for each ounce over the initial standard letter weight. This value is distinct from the base postage rate of a standard letter, which a Forever Stamp covers. For example, a Forever Stamp covers the $0.78 cost for a 1-ounce First-Class letter.

Additional ounce stamps complement other stamps, such as Forever Stamps, to meet the total postage for heavier letters. A letter weighing up to two ounces requires a Forever Stamp and one additional ounce stamp. A letter weighing up to three ounces needs a Forever Stamp and two additional ounce stamps.

Assessing Mail Weight and Postage Requirements

To determine if a mail item requires an additional ounce stamp, assess its weight accurately. A standard First-Class Mail letter has a base weight limit of one ounce. Letters exceeding this initial weight, up to 3.5 ounces, require additional postage for each subsequent ounce.

Weigh mail at home using a kitchen or dedicated postal scale for precise measurements. If a scale is unavailable, you can approximate the weight by comparing it to known items. The need for an additional ounce stamp is triggered when your mail item’s weight surpasses the base rate’s covered weight. If a mail item exceeds the 3.5-ounce limit for a standard letter, it moves into a different mail category, such as a large envelope (flat) or a package.

Applying Additional Postage

Once you determine the correct postage for your mail item, the stamps must be properly affixed. Postage stamps are placed in the upper right corner of the envelope. This placement ensures they are easily visible for postal processing.

You can combine an additional ounce stamp with other stamps, such as a Forever Stamp, to meet the total required postage. For instance, a letter weighing 1.5 ounces needs a Forever Stamp for the first ounce and one additional ounce stamp for the half-ounce increment. If you do not have an additional ounce stamp, you can use multiple Forever Stamps to cover the cost. Ensure all stamps are securely attached to the envelope.

Purchasing Additional Ounce Stamps

Consumers can obtain additional ounce stamps from several convenient locations. Purchase them at any United States Post Office (USPS) branch. Postal clerks can assist you in selecting the correct stamps.

Alternatively, additional ounce stamps are available through the official USPS website. Many authorized retail partners also stock these stamps, including grocery stores, pharmacies, and office supply stores. These stamps are typically sold in sheets or rolls.